Insulator and support for electric lines.



PATENTED JULY 23, 1907.

'1. VARNEY.

INSULAIOR AND SUPPORT FOR ELECTRIC LINES.

APPLIGATION FILED JUNE 4, 1906.

TOIINEY THEODORE VARNEY, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TOWESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATIONPENNSYLVANIA.

INSULA'IOR AND SUPPORT FOR ELECTRIC LINES.

Specification of Letters Patent.

Patented July 23, 1907.

Application filadkluna 4,1806. Serial No. 320,137.

To all whom it may concern:

Be it known that I THEODORE VARNEY, a citizen of the United States, anda resident of Pittsburg, in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement in Insulatorsand Supports for-Electric Lines, of which the following is aspecification.

My invention relates to insulators and supports for electric lines andit has for its object to provide a device of the aforesaidcharacter thatshall be simple and durable in construction and that shall be speciallyadapted for use with relatively heavy electric conductors'which aresupported at infrequent intervals.

I When electric lines, as frequently constructed in the prior art, forvarious purposes, have comprised small low voltage conductors, the lineinsulators were subjected to slight strains, particularly when the poleswere placed near together and when nothing was supported from theinsulators except the weight of the conductor attached to them. On theother hand, the modern design and construction of such electric lines asare adapted for high voltages and high speed trolleys, requireinsulators of an improved construction in order that they may withstandthe strains to which they are subjected.

According to my present invention, I provide an insulating support whichis specially adapted for use with a catenary form of line constructionwhich is supported at widely separated points, although it is of coursenot restricted to such use.

The single figure of the accompanying drawing is a side elevation of aninsulating support constructed in accordance with my invention.

The insulator illustrated in the drawing comprises a head 1 of hardinsulating material, a pin 2 on which the head is mounted, a supportingbracket 3 and a clamping device 4. The supporting bracket 3 is adaptedto engage a pair of angle irons 5 and 6 of which a suitable bridgestructure may be comprised and is fastened thereto by detachableclamping members I and bolts 8.

' A semi-cylindrical lodge 9 is formed substantially in the middle ofthe bracket into which the lower extremity of the pin 2 is seated, thepin 2 being held in position by means of U-shaped clamping bolts 10. Theends of the bolts pass through holes 11 in the bracket 3 and are engagedby nuts which are screw-threaded onto their ends. The pin 2 may comprisea rod or a tube of iron or other suitable material and is of suflicicntlength to project a considerable distance above the bracket.

The insulator head 1, to which a conductor may be attached, is providedwith a bell flange or ctticoat ]2 that decreases the electrical leakagebetween the conductor and the grounded bracket 3. The end of the engagethe tapered surface of the head 1 and clamping ears 16 and 17 that arepivotally attached to the collar clamp 15 at diametrically oppositepoints. The clamping ears 16 and 17 are provided with a groove 18, inwhich conductor 14 may lie, and suitable holes 19 through which U-shapedclamping bolts 20 may pass. The inner surface of the insulating head,which receives the end of the pin 2, may preferably be corrugated sothat cement or other suitable substance will form a more permanent jointwhen it is hardened.

The arrangement of parts hereinbefore described is of special advantagesince the insulator proper is relieved of substantially all exceptcompressional strains. This fact is obvious from the relative positionon opposite sides of the insulator head 1 of the pin 2 and the a collarclamp 15 which may readily be contrasted with the arrangement of theprior art in which strains have usually been applied to the insulator ata point considerably above the end of the supporting pin.

Although I have illustrated and described a sp'ecific arrangement, Idesire that only such limitations be imposed as are indicated in theappended claims.

I claim as my invention:

1. In an electric line construction, the combination with a head of hardinsulating material, a supporting pin there for and a collar clampattached to the head, or clamping ears that are pivotally attached tothe collar and a line conductor which is engaged by the clamping earsand rests upon the lop of the insulating head.

2. An insulating support for electric lines comprising a head having abell flange or petticoat of insulating material. a pin fitted into thehead, a collar clamp engaging its outer surface adjacent to the bellflange or petticoat and clamping ears that are pivotally attached to thecollar clamp.

3. A supporting insulator for electric lines that coniprlses :1 bracket,1! pin, an insulator having a hollow head fitted onto the pin, a bellflange or petticoat, a groove in the end of the insulating holly memberand a collar clamp nllached thereto which surrounds the end of the pinand is supported therefrom by the insulator and clamping cars that arepivotally attached to the collar.

4. An insulator for electric lines comprising :1 metal frame, a luhulurpin extending upwardly therefrom, a petlicoat insulator mounted thereonand a collar attached to the insulator and clamping cars that arepivotally ntlachcd lo the collar.

5. An insulator for elcclrlc lines that vomprlsos a bracket. :1semi-cylindrical lodge therein, a luhulnr pin sented in the ledge,II-shaped clamping "boits which hold said pin, a bell shaped memberintegral with the insulator,

the pin in position, a pettico'at insulator mounted on the pin, acollarattached to the insulator and clamping ears pivotally attached to thecollar. I I I 6. An insulator for electric lines comprising a tubularpin; a petitcoat insulator, a collar. mounted thereon and clampingearspivotally attached to the collar.

7. An insulator for electric lines comprising a metal frame, a tubularpin extending upwardly therefrom, a

10 molded insulator having a grooved head and mounted on a collarattached to the heiid and a pair of clamping ears pivotally attached toopposite points in the collar.

In testimony whereof, I have hereunto subscribed my name this 31st dayof May, 1906.

THEODORE VARNEYQ Witnesses:

ARTHUR J SWEET, BIRNEY Hmns.

